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Customer's spending in Summerfest is normally distributed with a mean of $18 and a standard deviation of $7. a) If a sample of 36 customers

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Customer's spending in Summerfest is normally distributed with a mean of $18 and a standard deviation of $7. a) If a sample of 36 customers in Summerfest is randomly drawn, what is the probability that the sample mean will be more than $20? b) If a sample of 30 customers in Summerfest is randomly drawn, what is the probability that the sample mean will be smaller than $16

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